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Hydrological Implications of Recent Droughts (2004–2022): A SWAT-Based Study in an Ancient Lowland Irrigation Area in Lombardy, Northern Italy

Author

Listed:
  • Alice Bernini

    (Department of Earth and Environmental Sciences, Università degli Studi di Pavia, Via Ferrata 1, 27100 Pavia, Italy)

  • Rike Becker

    (Department of Agroecosystem Analysis and Modelling, Faculty of Organic Agricultural Sciences, University of Kassel, 37213 Witzenhausen, Germany)

  • Odunayo David Adeniyi

    (Department of Earth and Environmental Sciences, Università degli Studi di Pavia, Via Ferrata 1, 27100 Pavia, Italy)

  • Giorgio Pilla

    (Department of Earth and Environmental Sciences, Università degli Studi di Pavia, Via Ferrata 1, 27100 Pavia, Italy)

  • Seyed Hamidreza Sadeghi

    (Department of Earth and Environmental Sciences, Università degli Studi di Pavia, Via Ferrata 1, 27100 Pavia, Italy
    Department of Watershed Management Engineering, Faculty of Natural Resources, Tarbiat Modares University, Noor 46417-76489, Iran)

  • Michael Maerker

    (Department of Earth and Environmental Sciences, Università degli Studi di Pavia, Via Ferrata 1, 27100 Pavia, Italy
    Department of Landscape Functioning, Leibniz Centre for Agricultural Landscape Research, 15374 Müncheberg, Germany)

Abstract

This study examines the hydrological dynamics of the Ticino irrigation cascade in northern Italy from 2004 to 2022. The region, which is shaped by human activity, is characterized by its flat topography and complex management of water resources, featuring a unique historic irrigation cascade. Utilizing the Soil and Water Assessment Tool (SWAT), we investigated the water availability during recent severe droughts in this complex agricultural environment, which lacks natural drainage. This area faces risks due to increasing temperatures and increased rainless days. Therefore, understanding the soil water dynamics is essential for maintaining the system’s sustainability. Calibrating and validating the SWAT model with runoff data was challenging due to the absence of natural drainage. Thus, we utilized MOD16 evapotranspiration (AET) data for calibration. Generally, the calibration and validation of the SWAT model yielded satisfactory results in terms of the Kling–Gupta efficiency (KGE). Despite some discrepancies, which were mainly related to the data sources and resolution, the calibrated model’s outputs showed increased actual evapotranspiration that was influenced by climate and irrigation, leading to water deficits and droughts. The soil water content (SWC) decreased by 7% over 15 years, impacting crop productivity and environmental sustainability. This also resulted in rising water stress for crops and the ecosystem in general, highlighting the direct impact of adverse climate conditions on soil hydrology and agriculture. Our research contributes to the understanding of soil–water dynamics, as it specifically addresses recent droughts in the Lombardy lowlands.

Suggested Citation

  • Alice Bernini & Rike Becker & Odunayo David Adeniyi & Giorgio Pilla & Seyed Hamidreza Sadeghi & Michael Maerker, 2023. "Hydrological Implications of Recent Droughts (2004–2022): A SWAT-Based Study in an Ancient Lowland Irrigation Area in Lombardy, Northern Italy," Sustainability, MDPI, vol. 15(24), pages 1-24, December.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:24:p:16771-:d:1298853
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    References listed on IDEAS

    as
    1. Donald Wilhite & Mark Svoboda & Michael Hayes, 2007. "Understanding the complex impacts of drought: A key to enhancing drought mitigation and preparedness," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 21(5), pages 763-774, May.
    2. Christian Bux & Mariarosaria Lombardi & Erica Varese & Vera Amicarelli, 2022. "Economic and Environmental Assessment of Conventional versus Organic Durum Wheat Production in Southern Italy," Sustainability, MDPI, vol. 14(15), pages 1-14, July.
    3. Lam, Q.D. & Schmalz, B. & Fohrer, N., 2010. "Modelling point and diffuse source pollution of nitrate in a rural lowland catchment using the SWAT model," Agricultural Water Management, Elsevier, vol. 97(2), pages 317-325, February.
    4. Uniyal, Bhumika & Dietrich, Jörg, 2019. "Modifying Automatic Irrigation in SWAT for Plant Water Stress scheduling," Agricultural Water Management, Elsevier, vol. 223(C), pages 1-1.
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